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Array.prototype.slice vs spread operator different syntax
(version: 0)
Compare the new ES6 spread operator with the traditional slice() method
Comparing performance of:
Array.prototype.slice vs spread operator
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.slice
spread operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in this benchmark and break down the different approaches. **Benchmark Definition** The test compares two ways to create a new array from an existing one: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`...`). **Options Compared** 1. **Array.prototype.slice()**: This method creates a shallow copy of a portion of an array, excluding the slice's start index up to but not including the end index. 2. **Spread Operator (new ES6 syntax)**: This operator creates a new array by copying elements from an existing array. **Pros and Cons** 1. **Array.prototype.slice()**: * Pros: + Well-established and widely supported method. + Can handle edge cases, like null or undefined values. * Cons: + Can be slower due to the overhead of function calls. + May not work as expected if used with non-array objects. 2. **Spread Operator**: * Pros: + More concise and readable syntax. + Can handle edge cases, like null or undefined values. * Cons: + Less widely supported than `Array.prototype.slice()`. + May not work as expected if used with non-array objects. **Library** There is no specific library being tested in this benchmark. The test only uses built-in JavaScript features. **Special JS Feature/Syntax** None of the individual test cases use any special or experimental JavaScript features. They are standard, widely supported syntax. **Other Alternatives** If you needed to create a new array from an existing one in JavaScript, other alternatives could be: 1. **Array.prototype.concat()**: Concatenates two arrays and returns a new array. 2. **Array.from()**: Creates a new array from an iterable or array-like object. However, `Array.prototype.slice()` and the spread operator are generally preferred due to their simplicity and readability. **Benchmark Preparation Code** The provided JSON doesn't include any preparation code, which means that the test cases are likely to be self-contained and don't require any external setup. **Individual Test Cases** Let's analyze each test case: 1. **Array.prototype.slice()** This test case creates an array `params` with three elements: `"hello"`, `true`, and `7`. It then calls `slice()` on this array to create a new array `other`. 2. **Spread Operator** This test case also creates an array `params` with the same elements as above. However, instead of using `slice()`, it uses the spread operator (`...`) to create a new array `other`.
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